Thats kind of crazy
$3 for 100% would give you around $30 a day in upvote power, give or take a few cents, thats $300 for 10 days and around 900 for a month, thats not even considering the USD price of steem that day...
thats a mighty powerful upvote ya got there
I upvoted a post at $1.11, and it went to $5.10 after. That's $3.99 for a 100% vote bar at 91% vote power drain.